摘要
新寨锡矿床位于滇东南褶皱带的文山－马关隆起，为近年发现的一大型锡矿，矿体产于中寒武统变质岩系，以顺层厚大矿体产出为特征。仅有锡石可利用。中下寒武统中锡丰度比地壳丰度高出数倍至百余倍。为矿源层。氧同位素分析证明有大气降水和变质水参予成矿作用。硫来自火山岩和海水硫酸盐。成矿年龄为２００Ｍａ左右，与区域变质年龄接近，为印支期变质热液改造成矿，属沉积─改造层控型锡矿床。
Xinzhai tin deposit is in the Wenshan-Maguan Rise of Southeast Yunnan Fold Belt. It is a large tin deposit discovrted in recent Years. The stratified and thick ore body occurs in Middle Cambrian metamorphic rock series and there is only cassitrtite available. Middle-Lower Cambrian rocks are the origin of ore, Whose tin abundance is several to more than one hundred times higher thar that of rhe crust. It is confirmed by 0-isotope analysis that meteoric water and metamorphic water have taken part in the metallogenic activity. S came from volcanic rocks and sulfate in the sea water. Mineralization K-Ar age is 200 Ma, which is similar to the regional metamorphic age. The deposit is formed by the metamorphic hydrothermal reformation in Indosinian and belongs to the tin deposit of sedimentation-reformation stratabound type.
出处
《云南地质》
1994年第1期1-16,共16页
Yunnan Geology
